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• dpkg reporting as installed, uninstalled kernels

  - by Tony Martin

  I have run the following command to remove old kernels: dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d' | xargs sudo apt-get -y purge and only the current kernel is now installed, which I have confirmed in synaptic and by checking my boot partition. However, when I run: dpkg --list | grep linux-image I get the following response: rc linux-image-3.13.0-30-generic 3.13.0-30.55 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP rc linux-image-3.13.0-32-generic 3.13.0-32.57 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP ii linux-image-3.13.0-34-generic 3.13.0-34.60 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP rc linux-image-extra-3.13.0-30-generic 3.13.0-30.55 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP rc linux-image-extra-3.13.0-32-generic 3.13.0-32.57 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP ii linux-image-extra-3.13.0-34-generic 3.13.0-34.60 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP ii linux-image-generic 3.13.0.34.40 amd64 Generic Linux kernel image Probably not a problem, but just wondering why versions -30 and -32 are reported as present. Can it be rectified? TIA

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• Remote Control Home PC from Corporate Work PC

  - by muncherelli

  Here is my situation: I am currently on a Windows XP workstation at work. I have an android tablet that I use to splashtop into my home PC. I would like to be able to use my work keyboard and mouse to control my home PC while I am splashtop'd into it using my tablet. My work PC is on a corporate LAN, and not on the same network as my tablet. The company I work for provides wifi for personal devices, but they are not accessable to the internal network. I thought about going the Synergy route, however that would require my home PC to be able to connect to my work PC which isn't really possible. The opposite would work though, if I could reverse connect the server to the client, but the Synergy software doesn't really support that. I do have a couple linux boxes running at home, so I can ssh into my home network and tunnel ports via SSH if needed. With what I have, how can I accomplish seamless keyboard and mouse sharing between my work PC and either my home PC or my android tablet?

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• Accidentally dd'ed an image to wrong drive / overwrote partition table + NTFS partition start

  - by Kento Locatelli

  I screwed up and set the wrong output for dd when trying to copy a freenas iso, overwriting the wrong external hard drive. Ironically, I was trying to setup a freenas server for data backup... External drive is only used for data storage, system is entirely intact Drive had a single NTFS partition filing the entire device (2TB WD elements) Drive originally had an MBR partition table. Drive now shows as having a GPT, presumably from the freenas image. Drive was mounted at the time, with maybe a couple kB of data written/read after running dd Drive is just a few months old and healthy (regular SMART / fs checks) I have not reboot the OS (crunchbang) /proc/partition still holds the correct information (and has been stored) Have dd's output (records in / out / bytes) testdrive did not find any partitions on quick or deep search running photorec to recover the more important data (a couple recent plaintext files that hadn't been backed up yet). Vast majority of disk content ( 80%) is unnecessary media files. My current plan is to let photorec do it's thing, then recreate the mbr with gparted and use cfdisk to create another NTFS partition using the sector information from /sys/block/.../. Is that a good course of action (that is, a chance of success)? Or anything else I should try first? Possibly relevant information: dd if=FreeNAS-8.0.4-RELEASE-p3-x86.iso of=/dev/sdc: 194568+0 records in 194568+0 records out 99618816 bytes (100 MB) copied grep . /sys/block/sdc/sdc*/{start,size}: /sys/block/sdc/sdc1/start:2048 /sys/block/sdc/sdc1/size:3907022848 cat /proc/partitions: major minor #blocks name ** Snipped ** 8 32 1953512448 sdc 8 33 1953511424 sdc1 current fdisk -l output: WARNING: GPT (GUID Partition Table) detected on '/dev/sdc'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sdc: 2000.4 GB, 2000396746752 bytes 255 heads, 63 sectors/track, 243201 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/sdc doesn't contain a valid partition table

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• libgdx draw issue and animation

  - by johnny-b

  it seems as though i cannot get the draw method to work??? it seems as though the bullet.draw(batcher) does not work and i cannot understand why as the bullet is a sprite. i have made a Sprite[] and added them as animation. could that be it? i tried batcher.draw(AssetLoader.bulletAnimation.getKeyFrame(runTime), bullet.getX(), bullet.getY(), bullet.getOriginX() / 2, bullet.getOriginY() / 2, bullet.getWidth(), bullet.getHeight(), 1, 1, bullet.getRotation()); but that dont work, the only way it draws is this batcher.draw(AssetLoader.bulletAnimation.getKeyFrame(runTime), bullet.getX(), bullet.getY()); below is the code. // this is in a Asset Class texture = new Texture(Gdx.files.internal("SpriteN1.png")); texture.setFilter(TextureFilter.Nearest, TextureFilter.Nearest); bullet1 = new Sprite(texture, 380, 350, 45, 20); bullet1.flip(false, true); bullet2 = new Sprite(texture, 425, 350, 45, 20); bullet2.flip(false, true); Sprite[] bullets = { bullet1, bullet2 }; bulletAnimation = new Animation(0.06f, bullets); bulletAnimation.setPlayMode(Animation.PlayMode.LOOP); // this is the GameRender class public class GameRender() { private Bullet bullet; private Ball ball; public GameRenderer(GameWorld world) { myWorld = world; cam = new OrthographicCamera(); cam.setToOrtho(true, 480, 320); batcher = new SpriteBatch(); // Attach batcher to camera batcher.setProjectionMatrix(cam.combined); shapeRenderer = new ShapeRenderer(); shapeRenderer.setProjectionMatrix(cam.combined); // Call helper methods to initialize instance variables initGameObjects(); initAssets(); } private void initGameObjects() { ball = GameWorld.getBall(); bullet = myWorld.getBullet(); scroller = myWorld.getScroller(); } private void initAssets() { ballAnimation = AssetLoader.ballAnimation; bulletAnimation = AssetLoader.bulletAnimation; } public void render(float runTime) { Gdx.gl.glClearColor(0, 0, 0, 1); Gdx.gl.glClear(GL30.GL_COLOR_BUFFER_BIT); batcher.begin(); // Disable transparency // This is good for performance when drawing images that do not require // transparency. batcher.disableBlending(); // The ball needs transparency, so we enable that again. batcher.enableBlending(); batcher.draw(AssetLoader.ballAnimation.getKeyFrame(runTime), ball.getX(), ball.getY(), ball.getWidth(), ball.getHeight()); batcher.draw(AssetLoader.bulletAnimation.getKeyFrame(runTime), bullet.getX(), bullet.getY()); // End SpriteBatch batcher.end(); } } // this is the gameworld class public class GameWorld { public static Ball ball; private Bullet bullet; private ScrollHandler scroller; public GameWorld() { ball = new Ball(480, 273, 32, 32); bullet = new Bullet(10, 10); scroller = new ScrollHandler(0); } public void update(float delta) { ball.update(delta); bullet.update(delta); scroller.update(delta); } public static Ball getBall() { return ball; } public ScrollHandler getScroller() { return scroller; } public Bullet getBullet() { return bullet; } } is there anyway so make the sprite work?

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• how to solve ArrayList outOfBoundsExeption?

  - by iQue

  Im getting: 09-02 17:15:39.140: E/AndroidRuntime(533): java.lang.IndexOutOfBoundsException: Invalid index 1, size is 1 09-02 17:15:39.140: E/AndroidRuntime(533): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251) when Im killing enemies using this method: private void checkCollision() { Rect h1 = happy.getBounds(); for (int i = 0; i < enemies.size(); i++) { for (int j = 0; j < bullets.size(); j++) { Rect b1 = bullets.get(j).getBounds(); Rect e1 = enemies.get(i).getBounds(); if (b1.intersect(e1)) { enemies.get(i).damageHP(5); bullets.remove(j); Log.d("TAG", "HERE: LOLTHEYTOUCHED"); } if (h1.intersect(e1)){ happy.damageHP(5); } if(enemies.get(i).getHP() <= 0){ enemies.remove(i); } if(happy.getHP() <= 0){ //end-screen !!!!!!! } } } } using this ArrayList: private ArrayList<Enemy> enemies = new ArrayList<Enemy>(); and adding to array like this: public void createEnemies() { Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.female); if (enemyCounter < 24) { enemies.add(new Enemy(bmp, this, controls)); } enemyCounter++; } I dont really understand what the problem is, Ive been looking around for a while but cant really find anything that helps me. If you know or if you can link me someplace where they have a solution for a similar problem Ill be a very happy camper! Thanks for ur time.

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• Easy to use JSON Web Service Hosts?

  - by Serguei Fedorov

  I saw this being used by someone in a college class once and cannot find anything that is analogous to it. I am not sure if this is the right place to ask about something like this, but hopefully I can get some direction. I want to write an app which uses web services that can obtain and push data back to the client apps. Right now I am gathering up the design and documentation of this app. Not having to code the web service myself would reduce development time by a lot; instead using an easy to setup web service that will be easy to setup and manage. Either XML based on JSON based is totally fine; though I would prefer JSON for its reduced overhead. Like I said I have seen this demonstrated before; you define the data structure to be stored and how it is treated. I cannot find the person who demonstrated this; hopefully maybe someone can suggest something? The service he used was free with a limited amount of requests allowed. EDIT: He was using an online service to do this not a script which is installed onto an existing web hosting account. Thank you!

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• How to connect Samsung Galaxy S3 via USB?

  - by dez93_2000

  Connecting as either MTP or PTP: neither allows one to see pictures saved as default by phone camera to DCIM folder on external SD card. Similar problems with previous models (e.g. S2) were solvable by 'usb utilities' in wireless & networking settings, but this is no longer present. Other suggestions have mentioned uninstalling various libraries... but I don't wanna just start cutting stuff without knowing it'll help. Any thoughts on how to mount a Samsung Galaxy S3 over USB?

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• Getting photos and music on/off samsung/google galaxy nexus (ice cream sandwich) phone

  - by wim

  I am having trouble to access the filesystem on my phone. It just worked in previous version of Ubuntu, but now it appears empty whether it is mounted with MTP or PTP. I have followed a few guides on building and reinstalling libmtp etc without success. This answer did not help for me, either, and gMTP just hangs when I click the connect button. I know I can use wifi e.g. airdroid to access my photos, but this is too slow and a bit clumsy for me, and downloaded photos lose their original timestamps. Has anyone had success connecting to this phone on 12.04 ??

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• how does the rectangle bounds (x,y,width,height) in libgdx work

  - by JG22

  I cant work out how to use the rectangle bounds in libgdx I am currently using the superJumper example and have 2or 3 examples with that are pause Bounds = new Rectangle(320 - 64, 480 - 64, 64, 64); this is the pause button in the top right corner resume Bounds = new Rectangle(160 - 96, 240, 192, 36); this is a rectangle resume button in the middle of the page in the menu that comes up when the pause button is pressed. basically my question is aimed at the 360 -64 and 160 -96 because I don't know why this is used I need to create a rectangle that covers the left side of the screen and the same on the right because I want to create a on screen buttons, I have already created the does for these buttons and I have managed to get them to work but I can move the rectangles to where I want. Thank you If you can help

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• GestureListener's fling method doesn't get called

  - by nosferat

  I'm using SimpleGestureDetector from the libgdx-users Wiki as my InputProcessor. I set it in the created() method: Gdx.input.setInputProcess(new SimpleDirectionGestureDetector(charController)); charController is my class which implements the DirectionListener interface defined in the SimpleDirectionGestureDetector class and it is responsible for moving the player character. However the character doesn't change direction when I'm performing a fling action in any direction. I've checked and the fling() method in the SimpleDirectionGesture class doesn't get called and I have no idea why, since everything seems good. What am I doing wrong?

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• How do I draw a scrolling background?

  - by droidmachine

  How can I draw background tile in my 2D side-scrolling game? Is that loop logical for OpenGL es? My tile 2400x480. Also I want to use parallax scrolling for my game. batcher.beginBatch(Assets.background); for(int i=0; i<100; i++) batcher.drawSprite(0+2400*i, 240, 2400, 480, Assets.backgroundRegion); batcher.endBatch(); UPDATE And thats my onDrawFrame.I'm sending deltaTime for fps control. public void onDrawFrame(GL10 gl) { GLGameState state = null; synchronized(stateChanged) { state = this.state; } if(state == GLGameState.Running) { float deltaTime = (System.nanoTime()-startTime) / 1000000000.0f; startTime = System.nanoTime(); screen.update(deltaTime); screen.present(deltaTime); } if(state == GLGameState.Paused) { screen.pause(); synchronized(stateChanged) { this.state = GLGameState.Idle; stateChanged.notifyAll(); } } if(state == GLGameState.Finished) { screen.pause(); screen.dispose(); synchronized(stateChanged) { this.state = GLGameState.Idle; stateChanged.notifyAll(); } } }

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• OpenGL ES 2.0 gluUnProject

  - by secheung

  I've spent more time than I should trying to get my ray picking program working. I'm pretty convinced my math is solid with respect to line plane intersection, but I believe the problem lies with the changing of the mouse screen touch into 3D world space. Heres my code: public void passTouchEvents(MotionEvent e){ int[] viewport = {0,0,viewportWidth,viewportHeight}; float x = e.getX(), y = viewportHeight - e.getY(); float[] pos1 = new float[4]; float[] pos2 = new float[4]; GLU.gluUnProject( x, y, 0.0f, mViewMatrix, 0, mProjectionMatrix, 0, viewport, 0, pos1, 0); GLU.gluUnProject( x, y, 1.0f, mViewMatrix, 0, mProjectionMatrix, 0, viewport, 0, pos2, 0); } Just as a reference I've tried transforming the coordinates 0,0,0 and got an offset. It would be appreciated if you would answer using OpenGL ES 2.0 code.

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• In OpenGl ES 2, should I allocate multiple transformation matrices?

  - by thm4ter

  In OpenGl ES 2, should I declare just one transformation matrix, and share it across all objects or should I declare a transformation matrix in each object that needs it? for clarification... something like this: public class someclass{ public static float[16] transMatrix = new float[16]; ... public static void translate(int x, int y){ //do translation here } } public class someotherclass{ ... void draw(GL10 unused){ someclass.translate(10,10); //draw } } verses something like this: public class obj1{ public static float[16] transMatrix = new float[16]; ... void draw(GL10 unused){ //translate //draw } } public class obj2{ public static float[16] transMatrix = new float[16]; ... void draw(GL10 unused){ //translate //draw } }

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• How can I access bitmaps created in another activity?

  - by user22241

  I am currently loading my game bitmaps when the user presses 'start' in my animated splash screen activity (the first / launch activity) and the app progresses from my this activity to the main game activity, This is causing choppy animation in the splashscreen while it loads/creates the bitmaps for the new activity. I've been told that I should load all my bitmaps in one go at the very beginning. However, I can't work out how to do this - could anyone please point me in the right direction? I have 2 activities, a splash screen and the main game. Each consist of a class that extends activity and a class that extends SurfaceView (with an inner class for the rendering / logic updating). So, for example at the moment I am creating my bitmaps in the constructor of my SurfaceView class like so: public class OptionsScreen extends SurfaceView implements SurfaceHolder.Callback { //Create variables here public OptionsScreen(Context context) { Create bitmaps here } public void intialise(){ //This method is called from onCreate() of corresponding application context // Create scaled bitmaps here (from bitmaps previously created) }

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• What will be the better way for data retrieval on application that needs to handle limited amount of data?

  - by Milanix

  Just moved this question from Stack Overflow. Since, adding my code snippets itself would make this question really long. Instead, I am pretty interested in knowing a better ways for data retrieval on application that needs to handle limited amount of data which isn't updated regularly. Let's take this example: I am writing an application which gets a schedule as an XML from server. I have written a logic in order to parse XML version and update database only if the version is newer than the local version. Although the update is checked automatically/manually on daily basis based on user preference, the actual version update happens only once per few months or so. Since, this is done by some other authority which doesn't provide API but, rather inform publicly on their changes. The actual XML contains a "(n number of groups)(days in a week) (n number of schedule)" . The group is usually 6 and the number of schedule is usually 2. So basically there would usually be only around 100 strings. Now although I have used SQLite at the moment. I want to know how to make update on database. Should I show progress dialog that the application is updating and exit the app when it's done? Since, my updates are infrequent i don't think this will really harm user experience but, is there any better ways to do it? Because I don't want update to be made when user is searching which is done using database. This will cause an database already open exception. At least I have faced this problem before. Is it better to rather parse XML every time when user wants to view certain things or to use SQLite? Since, I make lots of use of adapter in my app to create lists, will that degrade the performance?

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• Is an Adnroid-based Phone a Suitable MP3 Player for Music Streamed over the Internet?

  - by James McFarland

  I am considering getting an HTC phone running Android from Verizon Wireless when I next upgrade my phone. I also have an online account with a music vendor, where I have rights to listen to my collection, but not download the MP3s. Further, I have an unlimited data plan and Wi-Fi, so I have full access to bandwidth volume without any concerns. I am especially interested in mounting my phone in a car kit, and streaming my online music to my car's sound system while driving. If you are experienced in this scenario, or have tried this scenario - Is is reasonable to expect my HTC Android phone to provide me with streaming music via my cell data plan anywhere I get cell service?

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• copy files to Nexus 4 on Kubuntu (13.04)

  - by cerr

  I know, this has been asked a few times already but I'm still having troubles to get files copied my new Nexus 4 phone mounted on my Kubuntu 13.04 machine. I followed the guide at: http://www.pocketables.com/2013/03/how-to-mount-the-lg-nexus-4-as-a-usb-drive-in-linux.html I would only get: $ cp -r /mnt/media/Albums/A\ Perfect\ Circle\ -\ Thirteenth\ Step/ . cp: accessing ‘.’: Transport endpoint is not connected reg@regDesktopHome:/media/nexus4/Internal storage/Music$ ls -l but thereafter , mount still shows it mounted: mtpfs on /media/nexus4 type fuse.mtpfs (rw,nosuid,nodev,allow_other) What's going on here? Thanks for the assistance!

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• AndEngine GLES2 - getting Black screen on emulator 4.1

  - by dizworld.com

  I'm new in andengine . I create following code public class MainActivity extends BaseGameActivity { static final int CAMERA_WIDTH = 800; static final int CAMERA_HEIGHT = 480; public Font mFont; public Camera mCamera; //A reference to the current scene public Scene mCurrentScene; public static BaseActivity instance; public EngineOptions onCreateEngineOptions() { instance = this; mCamera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT); return new EngineOptions(true, ScreenOrientation.LANDSCAPE_SENSOR, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), mCamera); } @Override public void onCreateResources(OnCreateResourcesCallback arg0) throws Exception { mFont = FontFactory.create(this.getFontManager(),this.getTextureManager(), 256, 256,Typeface.create(Typeface.DEFAULT, Typeface.BOLD), 32); mFont.load(); } @Override public void onCreateScene(OnCreateSceneCallback arg0) throws Exception { mEngine.registerUpdateHandler(new FPSLogger()); mCurrentScene = new Scene(); Log.v("Scene","enter"); mCurrentScene.setBackground(new Background(0.09804f, 0.7274f, 0.8f)); // return mCurrentScene; } @Override public void onPopulateScene(Scene arg0, OnPopulateSceneCallback arg1) throws Exception { // TODO Auto-generated method stub } } I got code on sites there is returning scene but in AndEngine GLES2 in method onCreateScene() there is no return scene ... so my First run is BLACK .. any suggestion :)

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• What will be the better way for data retrieval on application that needs to handle limited amount of data.?

  - by Milanix

  This is not really a coding question since, I am not adding any code in here. Since, adding my code snippets itself would make this question really long. Instead, I am pretty interested in knowing a better ways for data retrieval on application that needs to handle limited amount of data which isn't updated regularly. Let's take this example: I am writing an application which gets a schedule as an XML from server. I have written a logic in order to parse XML version and update database only if the version is newer than the local version. Although the update is checked automatically/manually on daily basis based on user preference, the actual version update happens only once per few months or so. Since, this is done by some other authority which doesn't provide API but, rather inform publicly on their changes. The actual XML contains a "(n number of groups)(days in a week) (n number of schedule)" . The group is usually 6 and the number of schedule is usually 2. So basically there would usually be only around 100 strings. Now although I have used SQLite at the moment. I want to know how to make update on database. Should I show progress dialog that the application is updating and exit the app when it's done? Since, my updates are infrequent i don't think this will really harm user experience but, is there any better ways to do it? Because I don't want update to be made when user is searching which is done using database. This will cause an database already open exception. Atleast I have faced this problem before. Is it better to rather parse XML every time when user wants to view certain things or to use SQLite? Since, I make lots of use of adapter in my app to create lists, will that degrade the performance? It would really be a great help if anyone can give me better overview about it. Or may be counter argument against each. Many thanks!

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• Amazon GameCircle Integration

  - by user1095509

  I'm trying to integrate Amazon GameCircle and I have been able to successfully initialize GameCircle in my app, but the problem is when I click on the button that displays achievements, the GameCircle achievement list comes up but it says "You have unlocked 0 of 0 achievements". Same happens with leaderboards i.e there are no leaderboards for this app. I have created a Leaderboard and a few achievements on the online developer portal for Amazon but they don't show for some reason. Can someone help me with this. Any links/resources that help with integrating GameCircle will be appreciated. Thanks.

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• Adding delay between damage

  - by iQue

  I have a bunch of enemies chasing my main-character, and if they intersect I want them to damage him and that's all good. The problem is that right now they damage him as long as they stand around him, every frame! and since it gets called every frame my character's HP reaches 0 almost instantly. I've tried adding delay and I've tried a timertask, but can't get it to work. This is the code I use to check for intersection: private void checkCollision(Canvas canvas) { synchronized (getHolder()) { Rect h1 = happy.getBounds(); for (int i = 0; i < enemies.size(); i++) { for (int j = 0; j < bullets.size(); j++) { Rect b1 = bullets.get(j).getBounds(); Rect e1 = enemies.get(i).getBounds(); if (b1.intersect(e1)) { enemies.get(i).damageHP(5); bullets.remove(j); } if(e1.intersect(h1)){ happy.damageHP(5); // this is the statement that needs some sort of delay, I want them to damage him every 2 seconds they intersect him. } if(enemies.get(i).getHP() <= 0){ enemies.get(i).death(canvas, enemies); score.incScore(5); break; } if(happy.getHP() <= 0){ score.incScore(-50); //end-screen } } } } } If anyone knows the logic to do this please do tell.

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• What are the complications involved in this startup:Payments through authorization of fingerprints?

  - by jim859

  I want to make a mobile application where by people can send payments by authorization of finger prints. An email id will be registered and their finger print(unique for everyone) will be stored on our server.Person A and Person B are already registered and have installed the app.A and B deposit some money through our app from their credit card. When a person(Person A) want to send money to other people(person B), person B will ask person A to authorize his/her finger print on person B's mobile.The finger print will be retrieved from our servers and the payment will be made to person B. Person A will open the app (later or at that time) and confirm that yes he/she has authorized his/her finger print for the transaction.If person A has actually done the transaction,no problem.If person A has unknowingly or forcibly and opts that he/she has not authorized his/her finger print,money will be deducted from person B's account. What are the problems/vulnerabilities here,how can it be solved. Any other ways you can suggest to facilitate the transaction

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• OpenGL ES multiple objects not being rendered

  - by ladiesMan217

  I am doing the following to render multiple balls move around the screen but only 1 ball is seen to appear and function. I don't know why the rest (count-1) balls are not being drawn public void onDrawFrame(GL10 gl) { // TODO Auto-generated method stub gl.glDisable(GL10.GL_DITHER); gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT); gl.glMatrixMode(GL10.GL_MODELVIEW); gl.glClientActiveTexture(DRAWING_CACHE_QUALITY_HIGH); gl.glLoadIdentity(); for(int i=0;i<mParticleSystem.getParticleCount();i++){ gl.glPushMatrix(); gl.glTranslatef(mParticleSystem.getPosX(i), mParticleSystem.getPosY(i), -3.0f); gl.glScalef(0.3f, 0.3f, 0.3f); gl.glColor4f(r.nextFloat(), r.nextFloat(), r.nextFloat(), 1); gl.glEnable(GL10.GL_TEXTURE_2D); mParticleSystem.getBall(i).draw(gl); gl.glPopMatrix(); } } Here is my void draw(GL10 gl) method public void draw(GL10 gl){ gl.glEnable(GL10.GL_CULL_FACE); gl.glEnable(GL10.GL_SMOOTH); gl.glEnable(GL10.GL_DEPTH_TEST); // gl.glTranslatef(0.2f, 0.2f, -3.0f); // gl.glScalef(size, size, 1.0f); gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertBuff); gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); gl.glDrawArrays(GL10.GL_TRIANGLE_FAN, 0, points/2); gl.glDisableClientState(GL10.GL_VERTEX_ARRAY); }

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• glTranslate, how exactly does it work?

  - by mykk

  I have some trouble understanding how does glTranslate work. At first I thought it would just simply add values to axis to do the transformation. However then I have created two objects that would load bitmaps, one has matrix set to GL_TEXTURE: public class Background { float[] vertices = new float[] { 0f, -1f, 0.0f, 4f, -1f, 0.0f, 0f, 1f, 0.0f, 4f, 1f, 0.0f }; .... private float backgroundScrolled = 0; public void scrollBackground(GL10 gl) { gl.glLoadIdentity(); gl.glMatrixMode(GL10.GL_MODELVIEW); gl.glTranslatef(0f, 0f, 0f); gl.glPushMatrix(); gl.glLoadIdentity(); gl.glMatrixMode(GL10.GL_TEXTURE); gl.glTranslatef(backgroundScrolled, 0.0f, 0.0f); gl.glPushMatrix(); this.draw(gl); gl.glPopMatrix(); backgroundScrolled += 0.01f; gl.glLoadIdentity(); } } and another to GL_MODELVIEW: public class Box { float[] vertices = new float[] { 0.5f, 0f, 0.0f, 1f, 0f, 0.0f, 0.5f, 0.5f, 0.0f, 1f, 0.5f, 0.0f }; .... private float boxScrolled = 0; public void scrollBackground(GL10 gl) { gl.glMatrixMode(GL10.GL_MODELVIEW); gl.glLoadIdentity(); gl.glTranslatef(0f, 0f, 0f); gl.glPushMatrix(); gl.glMatrixMode(GL10.GL_MODELVIEW); gl.glLoadIdentity(); gl.glTranslatef(boxScrolled, 0.0f, 0.0f); gl.glPushMatrix(); this.draw(gl); gl.glPopMatrix(); boxScrolled+= 0.01f; gl.glLoadIdentity(); } } Now they are both drawn in Renderer.OnDraw. However background moves exactly 5 times faster. If I multiply boxScrolled by 5 they will be in sinc and will move together. If I modify backgrounds vertices to be float[] vertices = new float[] { 1f, -1f, 0.0f, 0f, -1f, 0.0f, 1f, 1f, 0.0f, 0f, 1f, 0.0f }; It will also be in sinc with the box. So, what is going under glTranslate?

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• Saving mobile application data when no service?

  - by Abe Miessler

  Say I have a mobile application that allows users to enter information which is then uploaded to a central location. I had planned on building this using only HTML5 and javascript (non-native app), but I'm assuming if someone is in an area where there is no service they simply will not be able to use the app. As a work around would it be possible to write a native app that saves the information on the device and then uploads it whenever service returns? If so, is it possible to write a native app entirely in HTML5 and Javascript that does this?

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